Your physics textbook is sliding to the right across the table. identify all forces acting on the object.

There are in total 4 forces acting on the object. Let's call m the mass of the object and g the gravitational acceleration. We have:

1) The force that is pushing the book, making it sliding along the table. This force acts horizontally, in the same direction of the displacement.

2) The frictional force between the textbook and the table, acting horizontally in the opposite direction of the displacement. This force is equal to

where is the coefficient of friction.

3) The weight of the object, acting vertically and downwards, equal to


4) The reaction force of the table against the textbook, acting vertically and upwards, equal to the weight of the object.

Answer sample (c); // would be best because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest;